To the later philosophers of antiquity the way in which Anaxagoras made use of his Nous for the interpretation of the world was strange, indeed scarcely pardonable; to them it seemed as though he had found a grand tool but had not well understood it and they tried to retrieve what the finder had neglected. They therefore did not recognise what meaning the abstention of Anaxagoras, inspired by the purest spirit of the method of natural science, had, and that this abstention first of all in every case puts to itself the question: "What is the cause of Something"? (_causa efficiens_)--and not "What is the purpose of Something"? (_causa finalis_). The Nous has not been dragged in by Anaxagoras for the purpose of answering the special question: "What is the cause of motion and what causes regular motions?"; Plato however reproaches him, that he ought to have, but had not shown that everything was in its own fashion and its own place the most beautiful, the best and the most appropriate. But this Anaxagoras would not have dared to assert in any individual case, to him the existing world was not even the most conceivably perfect world, for he saw everything originate out of everything, and he found the segregation of the substances through the Nous complete and done with, neither at the end of the filled space of the world nor in the individual beings. For his understanding it was sufficient that he had found a motion, which, by simple continued action could create the visible order out of a chaos mixed through and through; and he took good care not to put the question as to the Why? of the motion, as to the rational purpose of motion. For if the Nous had to fulfil by means of motion a purpose innate in the noumenal essence, then it was no longer in Its free will to commence the motion at any chance time; in so far as the Nous is eternal, It had also to be determined eternally by this purpose, and then no point of time could have been allowed to exist in which motion was still lacking, indeed it would have been logically forbidden to assume a starting point for motion: whereby again the conception of original chaos, the basis of the whole Anaxagorean interpretation of the world would likewise have become logically impossible. In order to escape such difficulties, which teleology creates, Anaxagoras had always to emphasise and asseverate that the Mind has free will; all Its actions, including that of the primal motion, were actions of the "free will," whereas on the contrary after that primeval moment the whole remaining world was shaping itself in a strictly determined, and more precisely, mechanically determined form. That absolutely free will however can be conceived only as purposeless, somewhat after the fashion of children's play or the artist's bent for play. It is an error to ascribe to Anaxagoras the common confusion of the teleologist, who, marvelling at the extraordinary appropriateness, at the agreement